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MostAwesomeDude says (in that link) that VDPAU is the only one worth implementing (compared to VAAPI, XvBA, and XvMC). What is it that makes it more worth implementing than VAAPI?

It's the current de-facto standard for video accel and most likely to be adopted widely by applications. That means it's the best choice for any driver to support. I think what OpenGL is for 3D graphics, VDPAU will be for video. So really, it's pretty much a must.